Quote:
Originally Posted by Mark_K
I don't know. My car has N55 and it says clearly "minimum octane rating (AKI) 91 - see owner manual" on the fuel door. Note "minimum". Assuming they made software changes to be able to recommend 89 for F30 (my car is E92), it would seem very improbable that they ALSO took off the capability to use 91 which was minimum recommended just 1 year prior.
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This is a nice factual bit. I was unaware the E92 indicates a minimum of 91.
I agree; one would expect that if BMW added capability to handle lower octane they would not remove the ability to utilize higher octane.
Others have raised the issue of decreased power. When Hyundai first released for its Genesis sedan, it stated on 91 the 4.6-liter V-8 produced 375 horsepower; on 87, 368. This is less than a two percent drop.
Ford indicates the Mustang produces 412 HP on 91, 400 on 87 - a three percent decrease.